My father told me as a teenager that, one way or another, it was my responsibility to learn something in each and every sacrament meeting. I have taken that admonition very seriously over the years, but with a slight twist to help make it happen.
I listen carefully and intently to the first couple of minutes of every single adult talk. If I am not getting fed by the speaker, I let my mind wander and pray that the Holy Ghost will feed me instead. This approach rarely has failed me.
I approach youth talks differently. I pay attention to the youth speakers for their entire talks. I smile whenever they look my way. No matter what is being said, I do my best to do whatever I can to help inexperienced, scared young men and young women feel like what they are saying is important - and that, by extension, they are important. I have worked too long with teenagers to give them anything less than that.